This is going to sound odd, but stick with me..that dog isn't acting genuinely aggressive in my not-at-all-expert opinion.
It's playing a fun game (in its own head, in reality yes it's attacking people).
The way it's doing a jump for the arm, after a lollopy waggy tail chase, makes me think the arsehole owner has been doing 'defence training' with it. The 'chase then bite a padded sleeve' type. The dog looks happy and relaxed and confused someone's bashed it. It lets go immediately, which I don't think it would do in an aggressive attack.
This is in no way a defence, more being grateful that it could have been a hell of a lot worse and wasn't. And if I'm right, shows exactly how much of an irresponsible dickhead it's owner is.
Agreed. That isn't typical aggression, that dog has been taught that. Body language is all wrong, the dog is being playful, it thinks its a game. Some moron has been training it to attack like that. People should have to pass tests before buying an animal. IQ tests.
That dog will have to be euthanised for his owners ego and stupidity. Owner should be shot. Alongside the breeder that sold him that poor dog.